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No. 171 July 30, 1997
aceska at freenet.victoria.bc.ca Victoria, B.C.
Dr. A. Ceska, P.O.Box 8546, Victoria, B.C. Canada V8W 3S2
PACIFIC NORTHWEST CARNIVOROUS PLANT SHOW - AUGUST 10, 1997
From: david.wong at hortus.bc.ca
The Pacific Northwest Carnivorous Plant Society (Canadian
Chapter) 1997 Show and Sale
will take place on Sunday, August 10, 1997
Richmond Nature Park (main pavilion)
11851 Westminster Highway, Richmond B.C.
(approx. 1/2 block west of No. 5 Road)
time: 11:00 am to 4:00 pm
admission: by donation
See different representatives of the many carnivorous plants
from around the world - including, Nepenthes from S.E. Asia,
Sarracenia from N. America, Pinguicula, Drosera from the tropics
to our backyard. Learn how to grow these plants.
For further info, please email: david.wong at hortus.bc.ca
FIELD KEY TO PIPERIA (ORCHIDACEAE) OF THE PACIFIC NORTHWEST
From: Randall Morgan, 3500 North Main Street, Soquel,
Two genera of rein-orchids occur in the Pacific Northwest
(Piperia Rydb. and Platanthera L.C. Rich.), both of which have
been subsumed by some authors under the genus Habenaria Willd.
Plants of the genus Piperia can be distinguished from these in
Platanthera by the following characters: 1) terrestrial rather
than semi-aquatic habitat; 2) stem leaves reduced to bracts; 3)
basal leaves usually withering before or during anthesis; 4)
stem arising from an ovoid tuber rather than fusiform roots; 5)
lip with median ridge rather than flat; 6) perianth parts one-
nerved; 7) anther cells opening laterally rather than apically;
8) flowers protandrous by movement of the lip.
Field key to Piperia of Oregon, Washington, British Columbia
1. Spur 2-6 mm, more or less shorter than lip
2. Flowers white, blade of lip becoming curved downward and
back toward spur
............................ P. candida Morgan & Ackerman
2. Flowers green to translucent, blade of lip straight or
curving slightly upward at tip
......................... P. unalascensis (Spreng.) Rydb.
1. Spur 7-15 mm, longer than lip
3. Perianth green or partially translucent; viscidia oval,
not much longer than wide; plant generally tall, slender
....................................... P. elongata Rydb.
3. Perianth parts white with green or yellow-green midvein,
viscidia oblong, about twice as long as wide; plants
robust to delicate
4. Plants relatively delicate (stem 1-3 mm diam.); spur
straight, held horizontally; lip projecting forward;
floral fragrance clovelike, nocturnal
............................... P. transversa Suksdorf
4. Plants relatively robust (stem usually more than 3 mm
diam.); spur usually more or less curved, often held
concealed against stem; lip curving downward in age;
floral fragrance often strong, but not clovelike
............................ P. elegans (Lindl.) Rydb.
(syn.: P. maritima [Greene] Rydb.)
[Viscidium (pl. viscidia) - a sticky structure usually connected
to the stipe that carry pollen masses, thus aiding in the
attachment of the pollen to pollinators.]
Ackerman, J.D. 1977. Biosystematics of the genus Piperia Rydb.
Botanical Journal of the Linnean Society 75: 245-270.
Coleman, R.A. 1995. The wild orchids of California. Cornell
University Press, New York. 201 p.
Morgan, R. & J. Ackerman. 1990. Two new Piperias (Orchidaceae)
from western North America. Lindleyana 5(4): 205-211.
Morgan, R. & L. Glicenstein. 1993. Additional California taxa in
Piperia (Orchidaceae). Lindleyana 8: 89-95.
NEW SPECIES FOR BRITISH COLUMBIA: CLARKIA VIMINEA (ONAGRACEAE)
From: Adolf & Oluna Ceska <aceska at freenet.victoria.bc.ca>
On July 20, 1997 we found a population of about 50 plants of
Clarkia viminea in Mt. Tzuhalem Ecological Reserve, near Duncan
on Vancouver Island (AC 31,134). The plants grew with Clarkia
amoena susbp. lindleyi on the warmest grassy slope dominated by
Clarkia viminea (Dougl. ex Hook.) A. Nels. & J.F. Macbr. has
been recently treated as a subspecies of C. purpurea (W. Curtis)
A. Nels. & J.F. Macbr. (subsp. viminea [Dougl. ex Hook.] H.F. &
M.E. Lewis). The plants are erect either simple or with erect
branches, slightly puberulent. The leaves are linear to lanceo-
late with short petioles or sessile. Flower buds are erect and
flowers are sessile with reflexed sepals and purplish or crimson